C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 11/00 (2006.01) C01B 17/22 (2006.01) C02F 1/38 (2006.01) C02F 1/52 (2006.01) C02F 1/66 (2006.01)
Patent
CA 2414083
The invention concerns a method for purifying sludge, suspected of containing toxic and/or precious heavy metals in view of the extraction, suspended in an aqueous solution and forming a mass to be treated. Said method consists in carrying out the following operations: mixing with the mass FeCl¿3? until an acid pH of the solution is obtained; mixing with the mass (CO¿2?H) and NH¿4?Cl until metallic pro-chelates are obtained; mixing the mass with mixed alkaline sulphides until a solution with a very basic pH is obtained, to form colloidal complex iron chelates, which trap said metals; neutralising the solution by adding an acid until alkaline-ferrous sulphides and hydroxides containing said metals are precipitated; forming by centrifuging, from the mass, a liquid phase and a solid phase containing said alkaline-ferrous sulphides.
Procédé d'épuration de boues, supposées contenir des métaux lourds, toxiques et/ou précieux en vue de les extraire, en suspension dans une solution aqueuse et formant ensemble une masse à traiter. Ce procédé consiste à effectuer les opérations suivantes: (a) mélange avec la masse de FeCl3 jusqu'à obtenir un pH acide de la solution, (b) mélange avec la masse de (CO2H)2 et de NH4Cl jusqu'à former des pro-chélates métalliques, (c) mélange avec la masse de sulfures mixtes alcalins jusqu'à obtenir une solution présentant un pH très basique, pour former der chélates complexes colloïdaux de fer, qui piègent lesdits métaux, (d) neutralisation de la solution par adjonction d'un acide, jusqu'à provoquer la précipitation de sulfures alcalino-ferreux et des hydroxydes contenant lesdits métaux, (e) formation par centrifugation, à partir de la masse, d'une phase liquide et d'une phase solide, ladite phase solide contenant lesdits sulfures alcalino-ferreux.
Assoun Christian
Der Stepanian Manouk
Assoun Christian
Der Stepanian Manouk
Robic
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